What is apropos in Linux?

In computing, apropos is a command to search the man page files in Unix and Unix-like operating systems. Apropos takes its name from the French “à propos” (Latin “ad prōpositum”) which means about. It is particularly useful when searching for commands without knowing their exact names.

Is man the same as apropos?

The differences between apropos and whatis are simply where in the line they look, and what they are looking for. Apropos (which is equivalent to man -k) searches the argument string anywhere on the line, whereas whatis (equivalent to man -f) tries to match a complete command name only on the part before the dash.

Which of the following commands is the same as the apropos command?

The whatis command is similar to apropos except that it searches only for whole words that match the keywords, and it ignores parts of longer words that match the keywords. Thus, whatis is particularly useful if it is desired to obtain a brief description only about a specific command whose exact name is already known.

Which command used to search and list all commands in whatis database whose short description match the specified keyword?

Using apropos to search man pages

apropos searches a set of database files containing short descriptions of system commands for keywords and displays the result on the standard output.

How do I list files in Linux?

See the following examples:

  1. To list all files in the current directory, type the following: ls -a This lists all files, including. dot (.) …
  2. To display detailed information, type the following: ls -l chap1 .profile. …
  3. To display detailed information about a directory, type the following: ls -d -l .

What is the use of Locate command in Linux?

locate is a Unix utility which serves to find files on filesystems. It searches through a prebuilt database of files generated by the updatedb command or by a daemon and compressed using incremental encoding. It operates significantly faster than find , but requires regular updating of the database.

What does df command do in Linux?

The df command (short for disk free), is used to display information related to file systems about total space and available space. If no file name is given, it displays the space available on all currently mounted file systems.

What is the use of TTY command in Linux?

The tty command of terminal basically prints the file name of the terminal connected to standard input. tty is short of teletype, but popularly known as a terminal it allows you to interact with the system by passing on the data (you input) to the system, and displaying the output produced by the system.

Is Linux a Posix?

For now, Linux is not POSIX-certified due to high costs, except for the two commercial Linux distributions Inspur K-UX [12] and Huawei EulerOS [6]. Instead, Linux is seen as being mostly POSIX-compliant.

How does grep work in Linux?

Grep is a Linux / Unix command-line tool used to search for a string of characters in a specified file. The text search pattern is called a regular expression. When it finds a match, it prints the line with the result. The grep command is handy when searching through large log files.

What is the output of who command?

Explanation: who command output the details of the users who are currently logged in to the system. The output includes username, terminal name (on which they are logged in), date and time of their login etc. 11.

How do I search for a filename in Linux?

Basic Examples

  1. find . – name thisfile.txt. If you need to know how to find a file in Linux called thisfile. …
  2. find /home -name *.jpg. Look for all . jpg files in the /home and directories below it.
  3. find . – type f -empty. Look for an empty file inside the current directory.
  4. find /home -user randomperson-mtime 6 -iname “.db”

Where are binary commands stored?

Purpose. Utilities used for system administration (and other root-only commands) are stored in /sbin , /usr/sbin , and /usr/local/sbin . /sbin contains binaries essential for booting, restoring, recovering, and/or repairing the system in addition to the binaries in /bin .

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